Method for correcting parcentricity in zoom systems
AssigneeCarl Zeiss Microscopy GmbH
InventorsDetlef Hein, Steffen Leidenbach
Life of this patent
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Abstract
A method for correcting the parcentricity in zoom systems. The positional difference in the image between at least two different zoom positions is detected in order to explicitly or implicitly determine the position in the image which remains stationary during zooming. The travel lengths of a means for positioning the object in the object plane required for correcting the zoom-dependent parcentricity error are calculated and provided as control variable for the appropriate positioning of the means for positioning the object in the object plane, such that the target position appears stationary in the image after or during zooming.
Claims13
A method for correcting parcentricity in an optical zoom system, said optical zoom system including an object positioning stage and providing for a zoom range of a current optically effective configuration comprising a currently active objective, the method comprising:
- detecting a positional difference in an image of an object between at least two different zoom positions of said current optically effective configuration;
- determining a zoom center in the image which remains stationary during zooming;
- calculating the travel lengths of the object positioning stage required to correct the zoom-dependent parcentricity error;
- and
- providing said calculated travel lengths as a control variable for the appropriate positioning of the object positioning stage, such that a target position appears stationary in the image during zooming throughout said zoom range.
Dependencies are inferred from the claim text.